public class Request
{
    public const string GET_ROUND_NUM_REQUEST = "RoundNum";
    public const string GET_ROUND_REQUEST = "Round";
    public const string GET_RANKING_REQUEST = "Ranking";
    public const string ADD_RANKING_REQUEST = "AddRanking";
    public const string EXIT_REQUEST = "Exit";
    public const string NONE_REQUEST = "None";

    public string Username = string.Empty;
    public string Operation = string.Empty;
    public int Index = 0;
    public Record Record;

    public Request(string username, string operation, int index = 0, Record record = null)
    {
        Username = username;
        Operation = operation;
        Index = index;
        Record = record;
    }
}